<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
                <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{
                    item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts" setup>
import { useRoute } from "vue-router"
import router from "@/router"

const route = useRoute()

type levelList = {
    path: string,
    meta: any,
    redirect: string
}

let levelList = reactive<levelList[]>([]);



watch(route, (newRoute) => {
    if (newRoute.path.startsWith('/redirect/')) {
        return
    }
    getBreadcrumb()
})

const getBreadcrumb = () => {
    // only show routes with meta.title
    let matched: any = route.matched.filter(item => item.meta && item.meta.title)
    const first = matched[0]

    if (!isDashboard(first)) {
        matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched)
    }

    levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
},
    isDashboard = (route) => {
        const name = route && route.name
        if (!name) {
            return false
        }
        return name.trim() === 'Index'
    },
    handleLink = (item) => {
        const { redirect, path } = item
        if (redirect) {
            router.push(redirect)
            return
        }
        router.push(path)
    }

getBreadcrumb()
</script>

<script lang="ts">
export default {
    name: 'BreadcrumbIndex'
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
        color: #97a8be;
        cursor: text;
    }
}
</style>
